There is...
And when I get around to it updates will come, but the past while I haven't been able to work on it.
If you want to try porting wolf3d to the DS you can forget about music unless you convert it, the arm7 is nowhere near powerful enough to emulate the YM3812 sound chip.
MP3 Does work but it's not practical for a game, the best bet would be to write an adpcm decoder and run it on the arm7.
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